First opinion
Earlier nations had more of the foremost; this Ummah had fewer
The large number refers to those who passed before this Ummah, while the small number refers to the companions or followers of Muhammad ﷺ.
In this reading, there are more Saabiqoon from previous and earlier nations, and fewer from the Ummah of Muhammad ﷺ.
ثُلَّةٌ مِنَ الْأَوَّلِينَ وَثُلَّةٌ مِنَ الْآَخِرِينَ
When 56:13–14 were revealed, the companions were saddened, and later the verses in the same surah describing a large number from the first peoples and a large number from the last peoples were revealed, relieving that sadness.
In this reading, الْأَوَّلِينَ refers to peoples before Islam, and الْآَخِرِينَ refers to the Ummah of Muhammad ﷺ.
Second opinion
The verse refers to the number of Prophets
Another view is that the statement concerns the numbers of Prophets: many among the earliest peoples, and fewer among the latter peoples.
The surrounding context, however, addresses the Saabiqoon, not the Prophets.
Third opinion — presented as most convincing
Both meanings can operate at the same time
The verse can carry more than one meaning simultaneously.
- It can mean that the foremost were many among previous nations and fewer in the Islamic nation.
- At the same time, الْأَوَّلِينَ can refer to the Sahabah themselves, while الْآَخِرِينَ refers to later generations of Muslims.
وَالسَّابِقُونَ الْأَوَّلُونَ مِنَ الْمُهَاجِرِينَ وَالْأَنصَارِ
Surah At-Tawbah 9:100 shows that the Muhajireen and Ansar can be described as both Saabiqoon and Awwaloon.